ue4-shader相关

ue4-shader相关

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前篇

• Shader Development - https://docs.unrealengine.com/latest/INT/Programming/Rendering/ShaderDevelopment/index.html
• HLSL - https://wiki.unrealengine.com/HLSL_Shaders
• Graphics Programming - https://docs.unrealengine.com/latest/INT/Programming/Rendering/index.html
• UE4 shader plugin demo - https://github.com/Temaran/UE4ShaderPluginDemo
• UE4需要自己写shader吗，要用到HLSL么？ - https://www.zhihu.com/question/50884693
• HLSL初级教程 - http://www.cppblog.com/liangairan/articles/57952.html
• 深度 与 模板 不错的实例 - https://www.parallelcube.com/2017/12/05/outline-effect-part-1/

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常用节点

vector 分量 分割与合并

参考: vector 相关操作文档 - https://docs.unrealengine.com/en-us/Engine/Rendering/Materials/ExpressionReference/VectorOps

• 分割, split component

  

• 合并, append vector

  Examples: Append of 0.2 and 0.4 is (0.2, 0.4); Append of (0.2, 0.4) and (1.0) is (0.2, 0.4, 1.0).

  A,B 可以使 vector1,2,3,4

  

• 拾取指定通道, component mask

  

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深度图使用

• Occlusion Outlines - https://www.youtube.com/watch?v=rL7VUeZzRyQ

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关于 step 函数

参考: https://answers.unrealengine.com/questions/201891/what-is-the-equivalent-to-an-hlsl-step-function-in.html?sort=oldest

没有这个 step 节点, 可以用自定义节点返回一个 HLSL 的 step 函数, 但是貌似官方不推荐自定义节点.

可以用另外两种方式实现 :

1. if
2. subtract -> sign -> saturate